http://www.bouncycastle.org/java.html: The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5. 
public class org.bouncycastle.asn1.crmf.ProofOfPossession extends org.bouncycastle.asn1.ASN1Encodable implements org.bouncycastle.asn1.ASN1Choice
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.asn1.crmf.ProofOfPossession
  super_class: org.bouncycastle.asn1.ASN1Encodable
{
  public static final int TYPE_RA_VERIFIED;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 0

  public static final int TYPE_SIGNING_KEY;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  public static final int TYPE_KEY_ENCIPHERMENT;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 2

  public static final int TYPE_KEY_AGREEMENT;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 3

  private int tagNo;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

  private org.bouncycastle.asn1.ASN1Encodable obj;
    descriptor: Lorg/bouncycastle/asn1/ASN1Encodable;
    flags: (0x0002) ACC_PRIVATE

  private void <init>(org.bouncycastle.asn1.ASN1TaggedObject);
    descriptor: (Lorg/bouncycastle/asn1/ASN1TaggedObject;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=5, locals=2, args_size=2
        start local 0 // org.bouncycastle.asn1.crmf.ProofOfPossession this
        start local 1 // org.bouncycastle.asn1.ASN1TaggedObject tagged
         0: .line 22
            aload 0 /* this */
            invokespecial org.bouncycastle.asn1.ASN1Encodable.<init>:()V
         1: .line 24
            aload 0 /* this */
            aload 1 /* tagged */
            invokevirtual org.bouncycastle.asn1.ASN1TaggedObject.getTagNo:()I
            putfield org.bouncycastle.asn1.crmf.ProofOfPossession.tagNo:I
         2: .line 25
            aload 0 /* this */
            getfield org.bouncycastle.asn1.crmf.ProofOfPossession.tagNo:I
            tableswitch { // 0 - 3
                    0: 3
                    1: 5
                    2: 7
                    3: 7
              default: 9
          }
         3: .line 28
      StackMap locals: org.bouncycastle.asn1.crmf.ProofOfPossession org.bouncycastle.asn1.ASN1TaggedObject
      StackMap stack:
            aload 0 /* this */
            getstatic org.bouncycastle.asn1.DERNull.INSTANCE:Lorg/bouncycastle/asn1/DERNull;
            putfield org.bouncycastle.asn1.crmf.ProofOfPossession.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
         4: .line 29
            goto 10
         5: .line 31
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 1 /* tagged */
            iconst_0
            invokestatic org.bouncycastle.asn1.crmf.POPOSigningKey.getInstance:(Lorg/bouncycastle/asn1/ASN1TaggedObject;Z)Lorg/bouncycastle/asn1/crmf/POPOSigningKey;
            putfield org.bouncycastle.asn1.crmf.ProofOfPossession.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
         6: .line 32
            goto 10
         7: .line 35
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 1 /* tagged */
            iconst_0
            invokestatic org.bouncycastle.asn1.crmf.POPOPrivKey.getInstance:(Lorg/bouncycastle/asn1/ASN1TaggedObject;Z)Lorg/bouncycastle/asn1/crmf/POPOPrivKey;
            putfield org.bouncycastle.asn1.crmf.ProofOfPossession.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
         8: .line 36
            goto 10
         9: .line 38
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "unknown tag: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            getfield org.bouncycastle.asn1.crmf.ProofOfPossession.tagNo:I
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        10: .line 40
      StackMap locals:
      StackMap stack:
            return
        end local 1 // org.bouncycastle.asn1.ASN1TaggedObject tagged
        end local 0 // org.bouncycastle.asn1.crmf.ProofOfPossession this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0   11     0    this  Lorg/bouncycastle/asn1/crmf/ProofOfPossession;
            0   11     1  tagged  Lorg/bouncycastle/asn1/ASN1TaggedObject;
    MethodParameters:
        Name  Flags
      tagged  

  public static org.bouncycastle.asn1.crmf.ProofOfPossession getInstance(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Lorg/bouncycastle/asn1/crmf/ProofOfPossession;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // java.lang.Object o
         0: .line 44
            aload 0 /* o */
            instanceof org.bouncycastle.asn1.crmf.ProofOfPossession
            ifeq 2
         1: .line 46
            aload 0 /* o */
            checkcast org.bouncycastle.asn1.crmf.ProofOfPossession
            areturn
         2: .line 49
      StackMap locals:
      StackMap stack:
            aload 0 /* o */
            instanceof org.bouncycastle.asn1.ASN1TaggedObject
            ifeq 4
         3: .line 51
            new org.bouncycastle.asn1.crmf.ProofOfPossession
            dup
            aload 0 /* o */
            checkcast org.bouncycastle.asn1.ASN1TaggedObject
            invokespecial org.bouncycastle.asn1.crmf.ProofOfPossession.<init>:(Lorg/bouncycastle/asn1/ASN1TaggedObject;)V
            areturn
         4: .line 54
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Invalid object: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* o */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // java.lang.Object o
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0     o  Ljava/lang/Object;
    MethodParameters:
      Name  Flags
      o     

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.crmf.ProofOfPossession this
         0: .line 58
            aload 0 /* this */
            invokespecial org.bouncycastle.asn1.ASN1Encodable.<init>:()V
         1: .line 60
            aload 0 /* this */
            iconst_0
            putfield org.bouncycastle.asn1.crmf.ProofOfPossession.tagNo:I
         2: .line 61
            aload 0 /* this */
            getstatic org.bouncycastle.asn1.DERNull.INSTANCE:Lorg/bouncycastle/asn1/DERNull;
            putfield org.bouncycastle.asn1.crmf.ProofOfPossession.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
         3: .line 62
            return
        end local 0 // org.bouncycastle.asn1.crmf.ProofOfPossession this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lorg/bouncycastle/asn1/crmf/ProofOfPossession;

  public void <init>(org.bouncycastle.asn1.crmf.POPOSigningKey);
    descriptor: (Lorg/bouncycastle/asn1/crmf/POPOSigningKey;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.bouncycastle.asn1.crmf.ProofOfPossession this
        start local 1 // org.bouncycastle.asn1.crmf.POPOSigningKey poposk
         0: .line 65
            aload 0 /* this */
            invokespecial org.bouncycastle.asn1.ASN1Encodable.<init>:()V
         1: .line 67
            aload 0 /* this */
            iconst_1
            putfield org.bouncycastle.asn1.crmf.ProofOfPossession.tagNo:I
         2: .line 68
            aload 0 /* this */
            aload 1 /* poposk */
            putfield org.bouncycastle.asn1.crmf.ProofOfPossession.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
         3: .line 69
            return
        end local 1 // org.bouncycastle.asn1.crmf.POPOSigningKey poposk
        end local 0 // org.bouncycastle.asn1.crmf.ProofOfPossession this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    4     0    this  Lorg/bouncycastle/asn1/crmf/ProofOfPossession;
            0    4     1  poposk  Lorg/bouncycastle/asn1/crmf/POPOSigningKey;
    MethodParameters:
        Name  Flags
      poposk  

  public void <init>(int, org.bouncycastle.asn1.crmf.POPOPrivKey);
    descriptor: (ILorg/bouncycastle/asn1/crmf/POPOPrivKey;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // org.bouncycastle.asn1.crmf.ProofOfPossession this
        start local 1 // int type
        start local 2 // org.bouncycastle.asn1.crmf.POPOPrivKey privkey
         0: .line 75
            aload 0 /* this */
            invokespecial org.bouncycastle.asn1.ASN1Encodable.<init>:()V
         1: .line 77
            aload 0 /* this */
            iload 1 /* type */
            putfield org.bouncycastle.asn1.crmf.ProofOfPossession.tagNo:I
         2: .line 78
            aload 0 /* this */
            aload 2 /* privkey */
            putfield org.bouncycastle.asn1.crmf.ProofOfPossession.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
         3: .line 79
            return
        end local 2 // org.bouncycastle.asn1.crmf.POPOPrivKey privkey
        end local 1 // int type
        end local 0 // org.bouncycastle.asn1.crmf.ProofOfPossession this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    4     0     this  Lorg/bouncycastle/asn1/crmf/ProofOfPossession;
            0    4     1     type  I
            0    4     2  privkey  Lorg/bouncycastle/asn1/crmf/POPOPrivKey;
    MethodParameters:
         Name  Flags
      type     
      privkey  

  public int getType();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.crmf.ProofOfPossession this
         0: .line 83
            aload 0 /* this */
            getfield org.bouncycastle.asn1.crmf.ProofOfPossession.tagNo:I
            ireturn
        end local 0 // org.bouncycastle.asn1.crmf.ProofOfPossession this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/crmf/ProofOfPossession;

  public org.bouncycastle.asn1.ASN1Encodable getObject();
    descriptor: ()Lorg/bouncycastle/asn1/ASN1Encodable;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.crmf.ProofOfPossession this
         0: .line 88
            aload 0 /* this */
            getfield org.bouncycastle.asn1.crmf.ProofOfPossession.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
            areturn
        end local 0 // org.bouncycastle.asn1.crmf.ProofOfPossession this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/crmf/ProofOfPossession;

  public org.bouncycastle.asn1.DERObject toASN1Object();
    descriptor: ()Lorg/bouncycastle/asn1/DERObject;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.crmf.ProofOfPossession this
         0: .line 105
            new org.bouncycastle.asn1.DERTaggedObject
            dup
            iconst_0
            aload 0 /* this */
            getfield org.bouncycastle.asn1.crmf.ProofOfPossession.tagNo:I
            aload 0 /* this */
            getfield org.bouncycastle.asn1.crmf.ProofOfPossession.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
            invokespecial org.bouncycastle.asn1.DERTaggedObject.<init>:(ZILorg/bouncycastle/asn1/DEREncodable;)V
            areturn
        end local 0 // org.bouncycastle.asn1.crmf.ProofOfPossession this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/crmf/ProofOfPossession;
}
SourceFile: "ProofOfPossession.java"